This has baffled scientists. Males weigh about 17 pounds. They have small vocal cords. But their bellows are 20 times lower than their vocal cords should be able to produce. A sound more matched to elephants! How do they do it?

Biologists at Britain’s University of Sussex dissected male koala specimens. They found something that noone had ever noticed before: Where the throat meets the nasal passage, there was an opening that led to a second set of vocal cords. And not just cute little koala-sized cords. These were heavily folded. In fact 600 times heavier than the main cords. Enough to produce low bellows.

To test this, the biologists repeatedly blew air through the dissected cords. Ew. But this confirmed that the cords could produce the bellow.

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